陈孝文,张德芬,石霜霜,王立君,吕东莉,施太和

• 1:西南石油大学材料科学与工程学院
• 2:天津大学材料科学与工程学院
• 3:西南石油大学油气藏地质及开发工程国家重点实验室

摘要(Abstract)：

利用疲劳试验机研究了28CrMo钢在三角波、方波和正弦波3种加载方式下三点弯曲疲劳实验过程中疲劳裂纹扩展速度与自发射磁信号的相关性,用扫描电镜对疲劳断口特征进行了研究。结果表明:加载方式不同,疲劳裂纹扩展速度不同,其中三角波加载方式下裂纹扩展速度最快,自发射磁信号最大,正弦波加载方式下裂纹扩展速度最慢,其自发射磁信号最小,方波加载方式则介于两者之间。基于磁荷概念和Ansys模拟结果分析了不同加载方式下疲劳裂纹扩展过程中自发射磁信号的变化规律。断口扫描分析结果表明3种加载方式下的疲劳断口均为类解理断裂。

关键词(KeyWords)： 加载方式;金属磁记忆;疲劳裂纹;Ansys模拟;磁荷

Abstract:

Keywords:

基金项目(Foundation): 天津市自然科学基金(11JCYBJC06000)

作者(Author): 陈孝文,张德芬,石霜霜,王立君,吕东莉,施太和

DOI: 10.13289/j.issn.1009-6264.2013.11.021

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